Implement runtime version injection and footer display

.github/workflows/docker-build-dev.yml

@@ -34,13 +34,26 @@ jobs:
       run: |
         echo "REPO_LC=${GITHUB_REPOSITORY,,}" >> $GITHUB_ENV
 
+    - name: Compute version string
+      run: |
+        SHA12="${GITHUB_SHA:0:12}"
+        BRANCH="${GITHUB_REF_NAME}"
+        if [ -z "${BRANCH}" ]; then
+          VERSION="dev"
+        else
+          VERSION="dev/${BRANCH}@${SHA12}"
+        fi
+        echo "VERSION=${VERSION}" >> $GITHUB_ENV
+
     - name: Build and push Docker image
       uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
       with:
         context: .
         push: true
         platforms: linux/amd64,linux/arm64
         tags: ghcr.io/${{ env.REPO_LC }}-snapshot:dev
+        build-args: |
+          VERSION=${{ env.VERSION }}
 
     - name: Set lowercase package name
       run: |

.github/workflows/release-docker-ghcr.yml

@@ -56,6 +56,8 @@ jobs:
         push: true
         platforms: linux/amd64,linux/arm64
         tags: ${{ steps.meta.outputs.tags }}
+        build-args: |
+          VERSION=${{ github.ref_name }}
 
     - name: Generate artifact attestation
       uses: actions/attest-build-provenance@00014ed6ed5efc5b1ab7f7f34a39eb55d41aa4f8 # v3.1.0

Dockerfile

@@ -4,6 +4,9 @@ FROM golang:1.25.6 AS builder
 # Set the working directory inside the container
 WORKDIR /app
 
+# Build argument for version injection
+ARG VERSION=dev
+
 # Copy the Go modules manifest and download dependencies
 COPY go.mod go.sum ./
 RUN go mod download
@@ -14,8 +17,8 @@ COPY . .
 # Ensures a statically linked binary
 ENV CGO_ENABLED=0
 
-# Build the Go server
-RUN go build -mod=readonly -o server .
+# Build the Go server with version injection
+RUN go build -mod=readonly -o server -ldflags "-X 'main.Version=${VERSION}'" .
 
 # Use a minimal base image for running the compiled binary
 FROM gcr.io/distroless/base-debian13

main.go

@@ -14,6 +14,9 @@ import (
 	"github.com/UnitVectorY-Labs/lockboxkms/internal/kms"
 )
 
+// Version is the application version, injected at build time via ldflags
+var Version = "dev"
+
 //go:embed templates/*
 var templatesFS embed.FS
 
@@ -50,8 +53,12 @@ func main() {
 	// Regular expression for validating key names
 	keyNameRegex := regexp.MustCompile(`^[a-zA-Z0-9_-]+$`)
 
-	// Load the HTML template from embedded filesystem
-	tpl := template.Must(template.ParseFS(templatesFS, "templates/index.html"))
+	log.Printf("Starting lockboxkms version %s", Version)
+
+	// Load the HTML template from embedded filesystem with version function
+	tpl := template.Must(template.New("index.html").Funcs(template.FuncMap{
+		"version": func() string { return Version },
+	}).ParseFS(templatesFS, "templates/index.html"))
 
 	// Set up HTTP handlers
 	http.HandleFunc("/", getHomeHandler(cfg, tpl))

templates/index.html

@@ -14,6 +14,7 @@
         body {
             background-color: #f3f4f6;
             display: flex;
+            flex-direction: column;
             align-items: center;
             justify-content: center;
             min-height: 100vh;
@@ -129,6 +130,20 @@
             color: red;
             margin-top: 1rem;
         }
+
+        footer {
+            text-align: center;
+            color: #9ca3af;
+            font-size: 0.8em;
+            padding: 15px 10px;
+        }
+        footer a {
+            color: #6b7280;
+            text-decoration: none;
+        }
+        footer a:hover {
+            text-decoration: underline;
+        }
     </style>
     <script src="https://unpkg.com/htmx.org@2.0.3/dist/htmx.min.js" integrity="sha384-0895/pl2MU10Hqc6jd4RvrthNlDiE9U1tWmX7WRESftEDRosgxNsQG/Ze9YMRzHq" crossorigin="anonymous"></script>
     <script src="https://unpkg.com/htmx-ext-response-targets@2.0.1/response-targets.js" integrity="sha384-25EjMH+UroVBJlocVAefkTNIVpGryrC7PN/vwZFZrLDWJ64ZlgE+7tOg1z7pWEfW" crossorigin="anonymous"></script>
@@ -177,5 +192,13 @@ <h1>LockboxKMS</h1>
             }
         }
     </script>
+    <footer>
+        <p>
+            <a href="https://github.com/UnitVectorY-Labs">UnitVectorY Labs</a> | 
+            <a href="https://opensource.org/licenses/MIT">MIT License</a> | 
+            <a href="https://github.com/UnitVectorY-Labs/lockboxkms"><strong>lockboxkms</strong> on GitHub</a>
+        </p>
+        <p>Version: {{ version }}</p>
+    </footer>
 </body>
 </html>